On what basis and how will you determne whether air is saturated with vapour or not ?

Explanation

Whether air is saturated with water vapour or not is determined on the basis of the extend to water vapour present in the air. If the relative humidity is 100%,air is saturated with water vapour.In that case,we can see formation of water droplets on the leaves of plants `//` grass.
If the relative humidity is less than 100%, air is not saturated with water vapour.